我认为完成任务后如何停止ScheduledThreadPoolExecutor中的任务

Question

我有一个ScheduledThreadPoolExecutor，可用来计划以固定速率运行的任务。我希望任务以指定的延迟最多运行10次，直到它“成功”为止。之后，我将不希望重试该任务。因此，基本上，当我希望停止计划任务时，需要停止运行它，但又不关闭ScheduledThreadPoolExecutor。知道我会怎么做吗？

这是一些伪代码-

public class ScheduledThreadPoolExecutorTest
{
  public static ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(15);  // no multiple instances, just one to serve all requests

  class MyTask implements Runnable
  {
    private int MAX_ATTEMPTS = 10;
    public void run()
    {
      if(++attempt <= MAX_ATTEMPTS)
      {
        doX();
        if(doXSucceeded)
        {
          //stop retrying the task anymore
        }
      }
      else
      { 
        //couldn't succeed in MAX attempts, don't bother retrying anymore!
      }
    }
  }

  public void main(String[] args)
  {
    executor.scheduleAtFixedRate(new ScheduledThreadPoolExecutorTest().new MyTask(), 0, 5, TimeUnit.SECONDS);
  }
}

Answer 1

运行此测试，它会打印1 2 3 4 5并停止

public class ScheduledThreadPoolExecutorTest {
    static ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(15); // no
    static ScheduledFuture<?> t;

    static class MyTask implements Runnable {
        private int attempt = 1;

        public void run() {
            System.out.print(attempt + " ");
            if (++attempt > 5) {
                t.cancel(false);
            }
        }
    }

    public static void main(String[] args) {
        t = executor.scheduleAtFixedRate(new MyTask(), 0, 1, TimeUnit.SECONDS);
    }
}